A man accused of fatally beating his father after prosecutors say he walked into a bathroom as his son’s girlfriend bathed is ready to go to trial, attorneys say.

Daniel Rak, 31, was charged in June 2016 with first-degree murder and two counts of aggravated domestic battery for allegedly killing his father, Jeffrey Rak, 58, in February 2016 in their Burlington Township home, according to Kane County State’s Attorney Joe McMahon.

Prosecutors say Rak became enraged and struck his father in the face after he walked into a bathroom as Daniel’s girlfriend, who also lived at the home, took a bath, the Chicago Tribune reports.

Emergency responders were called to the home the Raks shared on Feb. 14, 2016 and found Jeffrey Rak unresponsive, with bruising and swelling to his face and head, as well as dried blood. Rak’s cause of death was later determined to be blunt head trauma, McMahon said as Rak was formally charged.

Daniel Rak, who has pleaded not guilty, remains in Kane County Jail on $950,000 bond. He was initially taken into custody by authorities on Feb. 14, 2016, but wasn’t charged until four months later, the Tribune reports.

Rak’s attorney, meanwhile, has provided a preview of her client’s likely defense theory via pre-trial filings that suggest Jeffrey Rak was an alcoholic who was prone to seizures and falls who died from prior injuries instead of being attacked by his son.

Kane County Public Defender Kelli Childress has sought to dismiss the charges against Rak and pushed to block police officers from using the phrase “blood-like substance” when relaying what they saw in the home during a final pre-trial hearing on Thursday.

Childress said testing ruled out blood as the substance in some areas in the home. Judge D.J. Tegeler agreed, ruling that the phrase could only be used in a limited context.

Jury selection in the case is expected to begin Monday. If convicted, Rak faces between 20 and 60 years in prison.

“Jeffrey Rak’s death is an example of the most tragic result of domestic violence,” McMahon said in a statement last year. “Domestic violence is at the root of far more deaths than most people realize.”